Alternate Light Source Imaging. Forensic Photography by Norman Marin

By Norman Marin

Alternate gentle resource Imaging offers a quick consultant to electronic imaging utilizing mirrored infrared and ultraviolet radiation for crime scene photographers. transparent and concise guide illustrates the best way to accomplish strong photos in quite a few forensic occasions. It demonstrates how tunable wavelength gentle resources and electronic imaging concepts can be utilized to effectively find and record actual facts on the crime scene, within the morgue, or within the laboratory. The clinical rules that make this kind of images attainable are defined, by means of the fundamental steps that may be applied to seize top of the range evidentiary pictures.

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To summarize, reflected UV photography requires several considerations: • A filter over the lens is required that transmits UV radiation and acts as a barrier to visible light, not only from the ambient environment but also any fluorescence that could be induced from illuminating the evidence with UV radiation. • If the UV transmission filter has an IR leak, then a filtered source is required that only emits a band of UV radiation. , Baader filter), then any source that has an UV output could be used.

It also has a near-IR bandpass at 1150 nm, but this is beyond the sensitivity of a silicon-based digital camera sensor. 3 UV LIGHT SOURCES Sources used for UV photography can be of two types: continuous and line. Continuous sources emit radiation where the intensity slowly changes as a function of wavelength. Line sources only emit a number of lines or wavelength bands over a limited wavelength range. 5. 5 Sources that emit radiation in the UV spectral region. 365 nm along with some violet light.

For our purposes, the near-UV region is between approximately 300 and 400 nm (nearest to violet) and the far-UV region is between approximately 200 and 300 nm (furthest from violet). UV photography can be used to enhance evidence such as • • • • • • Biological fluids Fingerprints Bruising Gunshot residues Fibers Documents. 2 PHOTOGRAPHIC EQUIPMENT Cameras that have been modified or converted to full spectrum cameras, where the internal hot mirror has been removed, are only sensitive down to about 300 nm.

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